Lean Manufacturing: Value Stream Mapping

Symbols used on a value stream map (VSM) are precise visual representations of the steps of a process. There’s a group of symbols that are widely used when constructing a VSM. New ones could always be used (as long as its meaning is clearly defined), but it’s usually easier to use what is already available. Symbols help define a lot of information on the map without having to describe most of the standard operations. We’ll illustrate some examples of widely used symbols in this value stream map example. The triangle with an I in it represents an “on-queue” status either for inventory or quality checks. The trucks on either end of the map represent either receiving material from a supplier or shipping material out to a customer. Across the map you’ll see where all the process information goes with the data boxes below:
• The forklift symbol represents transporting inventory.
• There are symbols for both suppliers and customers.
• The little people represent operator involvement.
• The starburst (Kaizen burst) represents a burst event that has been selected to be improved.
• The trapezoid within the starburst represents Kanban information to replenish supplies.
• Arrows represent material flow.